Crossword Genius

To be so cutting is not natural (5)

Ross

I believe the answer is:

sharp

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'not natural' is the definition.
('sharp' is the opposite to 'natural')

I don't understand the remainder of the clue.

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(Other definitions for sharp that I've seen before include "Acute; pointed" , "Cutting; acidic" , "Quick-witted - keen" , "Punctually; raised note" , "Cutting; note" .)

I've seen this clue in the Evening Standard.
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